Schuckertwerke



A. WERNER.

OIL C00,LED ELECTRIC APPARATUS. I APPLICATION r|LED MAR.2s.1915. RingwfnDic. 1.1918.

Patented July 8, 1919.

UNITED ysrarns PATENT OFFICE.

ALBERT WERNER, 0F BERLIN-FRIEDENAU, GERMANY, ASSIGNOR TO SIEMENS-SCHUCKERTWERKE, G. M. '.B. H., 0F BERLIN, GERMANY, A CORPORATION OFGERMANY.

specification of Letters raamt.

Patented July 8, 1919.

Application filed March 23, 1915, Serial No. 16,476. Renewed Decemberv,1918. Serial No. 265,789.

T 0 all whom t may concern Be it known that I, ALBERT lVnnNnR, a. Germancitizen, and resident of Berlin- Friedenau, Germany, have inventedcertain new and useful Improvements in Oil-Cooled Electric Apparatus, ofwhich the following is a specification.

'This invention relates in brief to oilcooled electric apparatus, andespecially induction transformers, and has principally in view toobviate a difliculty encountered in apparatus of this class-on accountof the moisture which penetrates from the outside into the transformercasing at the place where the axle of the apparatus passes through thecover of the saine. Even in case closely fitting stuling boxes areemployed at the point of passage this difliculty cannot be solved. Inorder to avoid this disadvantage, according to my invention the point ofpassage of the axle through the transformer casing is provided with somekind of an oil s packing, that is with an oil container surrounding theaxle at its place of passage through the casing, and a furtherarrangement is used,\whereby the oil may be permitted to freely expandwhen its temperature is raised by the operation of the tiansformer. "A

In the drawing .I have shown a few embodiments of my invention; Figure 1shows an arrangement whereby besides the aforementioned meanspermittting the expansion of the oil a stuiing box is used together withan oil container' surrounding the same, Fig. 2 represents a constructionsimilar to Fig. l, whereby said stuffing box isessentially replaced byan oil-packing, and Fig. 3 shows a preferred construction, whereby saidoil packing is united with an expansion chamber.

In Fig. 1 t indicates the transformer, Z the point 0f passage of theaxle throughv the casing which is provided in the well known manner witha stutling box s, which is fully surrounded by the oil container g.lVith this arrangement the moisture containedin the air, as far as itcomes in Contact with the transformer, will be receivedby the oil aroundand above. the stuffing box and will be dissolved. therein, so that itis prevented from entering into the interior of the mam Oil tank of thetransformer.

The construction as shown in Fig. l may be more simplified as shown inFigs. 2 and 3, wherein the aforen'ientioned stuffing box is entirelyavoided. The same reference letters are used throughout the igures forthe same devices. In the case of Figs. :2 and 3 at the cover of the oiltank at the point of passage of the axle solely akind of loosely littingbearing for the axle is provided for, so that the inclosed oil will forma kind of packing between the axle and the cover of the casing.

If the transformer is provided with an expansion chamber which receivesthe surplus of oil due to expansion it is preferable to make the placeof passage of the axle through the cover of the voil tank of suchdimensions that the oil in the space near said passage will be able tofreely follow the fluctuations of the oil level in the expansionchamber. An arrangement of this kind iis shown in Fig. 2. In thismodification the cover of the tank is so formed as to create anadditional chamber g which substantially equivalent to the separatechambers g of Figs. 1 and 3. The opening in the cover through which theaxle passesA is of such dimensions, as indicated in the drawing that theoil in the container.' g will always be of the same level as that in thecontainer a. If now after some time the oil in the container g hasreceived moisture from the exterior air it will yet not be necessary toprovide a special closure toward the main tank, since the fluctuationsof the, oil in the expansion chamber take place very slowly, so that amixing of this oil with the oil in the main tank needs not to be fearedon account of the small cross-section of said chamber as compared withthe size of the main tank. The oil in the container f/ may easily be letofi' and replaced by new oil, if found necessary. Thus specialtightening means, such as stuiing boxes, will be entirely Aavoided inthe constructions of Figs. 2 and 3 at the point of passage of the axlethrough the cover as well as at any other place. For this latter purposethe driving mechanism Z) for the transformer axle and the bearing lis.arranged above the highest level of the oil, as shown inthe drawing.An Opening 0 may be provided at the upper part of the container g abovethe level of the pil, such as shown in the drawing, in order to equalizethe air pressure between the container g and the outer air.

In the case of Fig. 3 the oil container g is itself constructed in themanner of an expansion chamber. It is preferable to give to the bottom0f the container g a certain slope and to provide a discharge pipe -r atthe deepest point in order to be alole to remove the oil which hasbecome unfit for service due to the collection of greater quantities ofmoisture. Or, the pipe 7* may only be used for letting off the meisterpart of Vthe oil, which on account of the greater specific gravity hascollected near the bottom of the container.

Having thus described my invention I claim as new and desire to secureby Letters Patent of the United States tl. An oil-cooled electricapparatus comprising an oil tank, a cover therefor, a member rotatablymounted in said tank and having an axle passing through said cover, anoil chamber arranged above said cover and forming an oil packing betweensaid axle and said cover, and means, adapted to permit expansion of theoil in said tank, for permanently keeping said tank Completely filledwith oil.

Q.'An oil-cooled electric apparatus comprising an oil tank, a covertherefor, a member rotatablyv mounted in said tank and having an axlepassing through said cover, an oil chamber arranged above said coverforming an oil packing between said axle and said cover, said oilchamber being adapted to permit expansion of the oil in said tank and topermanently keep said tank completelyfilled with oil.

3,. An oil-cooled electric apparatus comprising an oil tank, a covertherefor, a member rotatably mounted in said tank and having an axlepassing through said cover, an oil chamber arranged above said coverforming an oil packing between said axle and said cover andcommunicating with the interior of said tank, said oil chamber beingadapted to permit expansion of the oil in said tank and to permanentlykeep said tank completely filled with oil.

4. An oil-cooled electric apparatus cornprising an oil tank, a covertherefor, a member rotatably mounted within said tank and having an axlepassing through said cover, an oil chamber mounted upon said cover forpermit-ting expansion of the oil in said tank and at thesame timeforming an oil packing between said axle and said cover at the place ofpassage therethrough.

5. An oil-cooled electric apparatus comprising an oil tank, a covertherefor, a member rotatably mounted within said tank and having an axlepassing through the same, an oil chamber mounted upon said cover andpermitting expansion of the oil packing between said axle and said coverat the place of passage therethrough, a bearing and a driving mechanismfor rotating said axle, said bearing and said driving mechanism beinglocated at the top of said chamber and above the highest oil leveltherein.

(3. An oil-cooled induction transformer comprising an oil tank, a coverfor said tank, a rotor body' having a vertical axle passing through saidcover, and a chamber provided on top of said cover surrounding said axleat its passage through said cover, said chamber permitting expansion ofthe oil in said tank at the same time forming an oil packing betweensaid axle and said cover.

In testimony whereof I have hereunto set my signature in the presence oftwo subscribing witnesses.

ALBERT lVERNER.

Titnesses VOLDEMAR HAUPT, HENRY HAsPER.

